$n^2+6n\:+\:9$
$\left(7a+4\right)\left(7a-3\right)$
$\left(3a^2\right)^3$
$\int s\:sin\:\left(2s\right)ds$
$\lim_{x\to3}\left(\frac{13-x}{x+2}\right)$
$\sqrt[5]{\frac{5x^2+1}{2x}}$
$n^2-n+2$
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